Note: There are scripts to help you do the necessary basic setup after flashing Jetson on Holybro's Github page:
https://github.com/Holybro/holybro-jetson-companion
Two methods to flash the board:

SDK Manager:

This is a GUI-based solution by Nvidia which can be found from the link below:https://docs.nvidia.com/sdk-manager/install-with-sdkm-jetson/index.html
Note: Keep it in mind that at the time of writing this document, we chose to install Jetpack 5.1.2.

Command Line:

You could benefit from Nvidia flash guide .

The difference here is you need to change the DIP switch on the carrier board to REC to boot in recovery mode.